Este sa k tomu vratim, je na tuto temu viac clankov a ofc vela roznych testov s roznymi charakteristikami ale rozumiem tomu tak ze ani test na IgM ti nepovie ci si nakazeny s nejakou rozumnou presnostou:

During the early stage of the infection (days 4–10), the IgM component of the test provides a sensitivity of just 70%. This rises rapidly to 92.3% between days 11 and 24 (v dnoch 0-4 je senzitivita IgM cca 0, ak spravne rozumiem)
https://www.nature.com/articles/d41587-020-00010-2